Manufacture of asbestos rings



Jan. 18, 1938. I KR ELT 2,106,1 19

MANUFACTURE OF ASBESTOS RINGS Original Filed May 16, 1936 L 1 H l L 1 I 1 Alt a h 'y Patented Jan. 18, 1938 PATENT orr ce' MANUFACTURE OF ASBESTOS RINGS Theodor Krasselt, ite'uth v/Neumark, Germany, assignor of four-fifths to Maurice Presburg, Paris, France, and one-fifth to George Angus &

Company Limited, Ne'wcastle-on-Tyn'e, England, a British company Original application May-16,1936, Serial No. 80,154. Divided and this application October 10, 1936, Serial No. 105,142. In Germany June 2 Claims. (01. 28- 1) This invention relates to the manufacture of asbestos rings for packing, jointing, brake linings, clutches and like purposes. Hitherto such rings have generally been stamped out from woven sheet with consequent considerable waste of material.

' In my UnitedStates application Serial No.

. 80,154 filed- 16th May 1936, from which the present application is divided, I have described a 'method of treating asbestos yarn so as to render it for the first time susceptible of being knitted on a machine without tearing and the object of Figure 2 shows the strip bent to conical form,w

Figure 3 is a plan view of the finished ring, and Figure 4 is a section along the line III-III in Figure 3. Figure 5 is a diagram illustrating the method of knitting together the ends of a fiat strip to form the ring of the present invention.

The method of procedure is as iollows:- The rings are made by knitting asbestos yarn in the form of a strip in the ordinary way on a standard flat knitting machine. This machine has two opposed banks of needles, extending upwardly at an angle of 45, long and short needles alternating in each bank, a long needle in one bank being opposite a short needle in the other. The operation of such machines in the knitting of fiat strips is well known, and need not be'described. Said strip is cut into sections after removal from the machine by cuts running aslant the-length of' the strip. One such section is shown at 23 in Figure l, the slanting cuts being indicatedatil. Theseimionis then bent into a conical formas shown in Figure -2 and the ends knitted together at?! this operation being performed manually according to the method of Figure 5. All that is necessary is to pick out 'fabric so that it can't come loose.

the material constituting the loops which have actually been severed and then to use the end of ,yarn unpicked from one end for threading through the exposed loops of the two ends, the end of this yarn being finally tuckedinto the 5 When the annulus so formed'is pressed flat a knitted asbestos ring 30 isobtained which is of perfect circular form and exhibits no trace of any seam. This ring is shown in plan in Figure 3 and hi section in Figure 4.

Where the ring is formed by cutting from a woven asbestos sheet, the edges are weakened owing to the fact that the woven material is cut across the warp and weft threads. The mechan- 15 ic'ally knitted rings made according to the invention do not suffer from this disadvantage as.

.they are knitted with finished edges, which is of great importance in the case of rings used for packing, jointing, brake linings, clutches and 2 0 like purposes.

After manufacture the ring may be treated with any suitable impregnant such as rubber.

The term asbestos as used herein includes not only pure-asbestos, but also asbestos mixed 25 with other fibrous material, suclras cotton, and asbestos reinforcedwith brass wire 'or other material. e

What I claim as my invention and desire to secure by- Letters Patent is:-- v 0 1. A method of manufacturing asbestos rings for packing, clutches, brake linings and like purposes, which consists in bending into frusto-conical form a flat strip of the fabricformed by knit- ,ting asbestos on a machine,-knitting the endsof 35 the strip together and finally pressing the strip flat to give a circular ring. I

2. A method of manufacturing asbestos rings for packing, clutches, brake linings and like purposes, which consists in knitting asbestos on a 40 machine to form a flat strip, dividing the strip into sections by cuttingit aslant its length, bending into frusto-conical form a section so obtained,

knitting the ends of the section together, and finally pressing it flat to'give a circular ring. 45

- THEODOR KRASSELT. 

